di·ag·no·sis | \ ˌdī-ig-ˈnō-səs , -əg- \
plural diagnoses\-ˌsēz \

Definition of diagnosis 

1a : the art or act of identifying a disease from its signs and symptoms

b : the decision reached by diagnosis the doctor's diagnosis

2a : investigation or analysis of the cause or nature of a condition, situation, or problem diagnosis of engine trouble

b : a statement or conclusion from such an analysis

3 biology : a concise technical description of a taxon

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Examples of diagnosis in a Sentence

The unusual combination of symptoms made accurate diagnosis difficult. She is an expert in the diagnosis and treatment of eye diseases. The diagnosis was a mild concussion. His doctor made an initial diagnosis of pneumonia. The committee published its diagnosis of the problems affecting urban schools.
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Recent Examples on the Web

Abby Lee Miller is not letting her cancer diagnosis get in the way of returning to Dance Moms. Christina Dugan, PEOPLE.com, "Abby Lee Miller Involved with Possible 8th Season of Dance Moms amid Cancer Battle," 12 July 2018 After the pioneering alternative rock band Sonic Youth announced its hiatus in 2011, Kim Gordon faced both the dissolution of her longtime creative and personal partnership with Thurston Moore and a breast cancer diagnosis. New York Times, "14 Pop, Rock and Jazz Concerts to Check Out in N.Y.C. This Weekend," 12 July 2018 Costello, who recently underwent surgery to combat a cancer diagnosis, was forced to cancel the final stops of his European tour due to doctor's orders. Sam Tornow, Billboard, "Arctic Monkeys Cover Elvis Costello Classic 'Lipstick Vogue:' Watch," 11 July 2018 Here, Kidman, 51, shares her tips for navigating the sun, how to get kids into healthy habits, and why her mother’s breast cancer diagnosis turned her onto meditation. Lindzi Scharf, latimes.com, "The real reason Oscar-winner Nicole Kidman is so passionate about sunscreen," 6 July 2018 Joe Jackson, the patriarch of the Jackson family music group and father of pop icon Michael, died Wednesday following reports of a cancer diagnosis, according to TMZ. Fox News, "Joe Jackson, patriarch of the Jackson family music group, dead at 89," 27 June 2018 Another friend divulged a cancer diagnosis cryptically via Facebook. Robin Abrahams, BostonGlobe.com, "A friend shared her cancer diagnosis on Facebook. How can I offer support?," 26 June 2018 April 2013: 'Flip or Flop' premieres — and Tarek receives a cancer diagnosis. Caroline Picard, Good Housekeeping, "What Really Led to Christina and Tarek El Moussa's Divorce," 25 June 2018 Her decades of medical work as well as her personal battles with three cancer diagnoses have convinced her that ending a terminally ill patient's suffering through medical aid can often be the right thing to do. Caroline Simon, USA TODAY, "With D.C. and California laws in jeopardy, a fresh debate over medical aid in dying," 25 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'diagnosis.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of diagnosis

1634, in the meaning defined at sense 1a

History and Etymology for diagnosis

New Latin, from Greek diagnōsis, from diagignōskein to distinguish, from dia- + gignōskein to know — more at know

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Statistics for diagnosis

Last Updated

20 Sep 2018

Look-up Popularity

Time Traveler for diagnosis

The first known use of diagnosis was in 1634

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More Definitions for diagnosis



English Language Learners Definition of diagnosis

: the act of identifying a disease, illness, or problem by examining someone or something

: a statement or conclusion that describes the reason for a disease, illness, or problem


di·ag·no·sis | \ ˌdī-əg-ˈnō-səs \
plural diagnoses\-ˌsēz \

Kids Definition of diagnosis

1 : the act of recognizing a disease from its signs and symptoms She specialized in the diagnosis and treatment of eye diseases.

2 : the conclusion that is reached following examination and testing The diagnosis was pneumonia.


di·ag·no·sis | \ ˌdī-ig-ˈnō-səs, -əg- \
plural diagnoses\-ˌsēz \

Medical Definition of diagnosis 

1a : the art or act of identifying a disease from its signs and symptoms

b : the decision reached by diagnosis a diagnosis of pneumonia

2 : a concise technical description of a taxon

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Comments on diagnosis

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the setting in which something occurs

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